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Author Topic: ALS 1300 Intermitant  (Read 2207 times)
K8OT
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Posts: 26




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« on: April 06, 2011, 05:27:08 AM »

My ALS 1300 was operating fine abt 4 dats ago fired it up yesterday 4-5-11 and it had mismatchon the PAB and kicked out when pwr raised above 300 wts. when right meter was raised to 15 amps left Mtr showed 13.5 amps.
 I decided to look at it this morning 4-6-11 and it ran fine just like new. both amp mtrs showed same.
Any Ideas?Huh
K8OT
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N4MPM
Member

Posts: 117




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« Reply #1 on: April 07, 2011, 05:11:21 AM »

Agent Orange-- all is Agent Orange!!! Roll Eyes Tongue
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KH6AQ
Member

Posts: 7998




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« Reply #2 on: April 07, 2011, 04:11:12 PM »

Sounds like a loose cable.  while applying RF hit the amp and the power supply to see if one has a loose connection. if a one of these is determined to have a loose connection open it and wiggle wires and push on components using a wooden stick.












« Last Edit: April 08, 2011, 06:12:50 AM by WX7G » Logged
K8OT
Member

Posts: 26




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« Reply #3 on: April 15, 2011, 11:35:11 AM »

Tnx fer reply
It worked for 2 days then when I fired it up this morning it had Missmatch.
I turned down the rig pwr. then briught the pwr slow and the right Mtr up to 15 amps the left one said 13.5  The voltage on each was 51 amps on both +or - 1 volt
If any higher the PA light came on
I think maybe a cold solder joint on one FET???

Whatca think
ED K8OT
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KM3F
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Posts: 910




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« Reply #4 on: April 15, 2011, 01:54:14 PM »

Heard of this issue a number of times so far with this model right here in my area.
The amp has design issues as admitted by the MFGER.
Any design that uses two or more amplifier units coupled to gather and powered by separate DC inputs will have an problem if one unit develops an issue.
Good luck.
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